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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 551815
Title Nucleic acid lateral flow assays using a conjugate of a DNA binding protein and carbon nanoparticles
Author(s) Aktas, Gülsen Betül; Wichers, Jan H.; Skouridou, Vasso; Amerongen, Aart van; Masip, Lluis
Source Microchimica acta 186 (2019)7. - ISSN 0026-3672
Department(s) BBP Bioconversion
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Enzyme conjugate - Escherichia coli - Immunochromatographic test - Nucleic acid lateral flow assay - Signal enhancement - Single-chain Cro

Nucleic acid lateral flow assays (NALFA) are often performed with gold nanoparticles. These are typically associated with ligand-labeled PCR amplicons via affinity interactions of adsorbed/conjugated proteins. Otherwise, they are conjugated to specific ssDNA sequences that hybridize to the target sequence. To avoid the need to generate ssDNA and to reduce the costs associated with primer labeling and antibody use, NALFA assays were developed that allow the direct detection of PCR amplicons using conjugates of a DNA binding protein with carbon nanoparticles (CNPs). The target gene encoding 16S ribosomal RNA of Escherichia coli was amplified by PCR using a single fluorophore-labeled forward primer and a reverse primer extended with the binding sequence of the bacteriophage lambda Cro repressor protein. Three different detection approaches were evaluated: (a) scCro/CNPs conjugate (black color), (b) HRP-scCro enzyme conjugate (red color), and (c) HRP-scCro/CNPs conjugate for dual color development. The limits of detection were between 6.9 and 10.4 ng of PCR product for all three approaches. These correspond to 3.0 to 4.5 × 103 CFU·mL−1. The single-step scCro/CNP approach proved to be the fastest one to perform and gave no false-positive signals. It also showed a broad dynamic range even though the signal intensities were lower compared to the enzyme-amplified tests. However, the latter ones produced some background signal. In our perception, the application of scCro in lateral flow assays to bind dsDNA appears to be an excellent alternative to the use of small tags that have to be chemically linked to synthetic primers. Finally, the approach is generic because any primer sequence can be extended with the specific scCro binding sequence. [Figure not available: see fulltext.].

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